* {
    padding: 0px;
    margin: 0px;
  }
  html,
  body,
  #app {
    width: 100%;
    height: 100%;
  }
  ul,
  ol {
    list-style: none;
  }
  a {
    text-decoration: none;
  }
  img {
    display: block;
  }
  /* 版心 */
  .main {
    min-width: 320px;
    max-width: 750px;
    margin: 0 auto;
  }
  h1,h2,h3,h4,h5,h6{
    font-weight: normal;
  }